2.8 Zero sequence voltage
protection U0> (59N)
2 Protection functions
Technical description
64
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VM55.EN005
Figure 2.8-1 Block diagram of the zero sequence voltage stages U
0
> and
U
0
>>
Parameters of the residual overvoltage stages U
0
>, U
0
>>
(59N):
Parameter
Value
Unit
Description
Note
Status
-
Blocked
Start
Trip
Current status of the stage
F
F
SCntr
Cumulative start counter
C
TCntr
Cumulative trip counter
C
SetGrp
1 or 2
Active setting group
Set
SGrpDI
-
DIx
VIx
LEDx
VOx
Fx
Digital signal to select the
active setting group
None
Digital input
Virtual input
LED indicator signal
Virtual output
Function key
Set
Force
Off
On
Force flag for status forcing for
test purposes. This is a
common flag for all stages and
output relays, too.
Automatically reset by a 5-
minute timeout.
Set
Uo
%
The supervised value relative
to Un/
3
Uo>, Uo>>
%
Pick-up value relative to Un/
3
Set
t>, t>>
s
Definite operation time
Set
For details of setting ranges see chapter 9.3.
Set = An editable parameter (password needed)
C = Can be cleared to zero
F = Editable when force flag is on
